Telephone-switch



(NQMode L) -T. J. MQTIGHE.

TELEPHONE SWITCH. I

Patented Jan; 9, 188 3.

Zine

UNITED STATES PATENT OFFICE.

THOMAS J. MOTIGHE, OF PITTSBURG, PENNSYLVANIA.

TELEPHONE-SWITCH.

SPECIFICATION forming part of Letters Patent No. 270,326, dated January 9, 1883.

Application filed June 16, 1881. (No model.)

To all whomtt may concern Be it known that I, THOMAS J. McTIcHn, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Telephone- Switches; and I do hereby declare that the following is a full, clear, and exact description ot'the inveniion,wh1ch will enable othersskilled in the art to which it appert'ains to make and use the same, reference being bad to the accompanying drawings, which form a part of this in actual operation it is desirable that the extra resistance of the receiver should be cut out of the line and the battery put on open circuit, and that when in usethe receiver should be in circuit, battery closed on transmitters, and bell-resistance cut out. Other changes are sometimes desirable also.

My invention consists in arranging upon the transmitter or other portion of the apparatus a protecting-door or othercoverin g, which must be moved for access to the apparatus or part thereof, and so constructing the terminals of the various circuits that the motion of the door or covering effects the switching, shunting, or'

cutting out, or anyof them.

My invention further consists in combining with a transmitter a protecting-door or covering, made dust-tight for the preservation of the working parts inside, and, further, in the combination and arrangement of parts, substantially as hereinafter fully described and claimed. 7 c

1n the drawings, A designates the transmitter-casin g. To the transmitter-box A, I attach a door, 0, which must be swung open or otherwise moved out of the way befo re access can be had to theinstrument inside or under cover.

I arrange the various circuits in such manner.

that the opening and closing or swinging of the door 0 will effect the proper modification of circuits. This may be done in a variety of modes; butone illustration will suffice for present purposes. I construct the sides and ends of the box A so as to project beyond the plane Now, let the batterypoints 0 d, bell-circuit terminate at c e, and

receiver-circuit terminate at c d When not in use the door 0 is shut, and may be fastened by a spring-catch orother device. When door 0 is shut strips 0 c'are pressed away from pins d d and metallic projection c of door 0 is in contact with strip 0. In this position the battery and transmitter circuit is cut or broken, as is also the receiver-circuit, and the bell-circuit is closed to the line. Now, before any conversation can be carried on, the door 0 must be opened, and the opening act allows strips 0 c to close on pins d d, while projection e leaves strip 0, and thus the bell-circuit is out, while transmitter and receiver circuits are closed for conversation. The principle may be applied to either the transmitter-boxorcallbox, or to a box placed to contain the receiver.

I do not confine the scope of my invention to the particular form and arrangementabove described, as the broad principle of adoor or other covering whose movement for access to interior shall operate switches may be applied in many ways within the ordinary skill of electricians.

The door 0 may be provided with a packing,

f, so that when shut all dust and insects will be excluded. In some countries this feature is important for the preservation of the parts.

I claim as my invention- 1. The combination of the terminals, springstrip 0, and pin 01 on box A with projection e on door U, substantially as described.

2. The combination, with a switch acting to make and break the main-line circuit through a signal-bell, ot' a second switch acting to In testimony that I claim the foregoing as simultaneously break and make the main-line my own I have hereto atfixed my signature circuit through a telephone, and a movable in presence of two witnesses.

cover for the transmitter. 1 i 5 3. The combination, with acircuit making THOMAS J. MCTIGHE.

and breaking switch for the loop containing the telephone and a switch controlling the 10- \Vitnesses:

cal circuit, of a hinged cover-plate for the T. J. PATTERSON,

transmitter and operating devices for said JAMES J. MCLIGHE. II) switches actuated by the cover-plate. 

